mirror of
https://github.com/AyuGram/AyuGramDesktop.git
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23rd
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "base/timer.h"
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#include "base/flat_map.h"
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namespace Ui {
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class RowsScrollCache final {
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public:
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explicit RowsScrollCache(Fn<void()> stopped);
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void markScrolling();
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[[nodiscard]] bool scrolling() const {
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return _scrolling;
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}
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[[nodiscard]] bool hasFresh(uint64 rowId, QSize physicalSize) const {
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const auto i = _images.find(rowId);
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return (i != end(_images)) && (i->second.size() == physicalSize);
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}
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template <typename PaintToImage>
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void paintRow(
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QPainter &p,
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uint64 rowId,
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QSize physicalSize,
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int ratio,
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PaintToImage &&paintToImage) {
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if ((_images.size() > kLimit || _memory > kMemoryLimit)
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&& !_images.contains(rowId)) {
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clear();
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}
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auto &image = _images[rowId];
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if (image.size() != physicalSize) {
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_memory -= image.sizeInBytes();
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image = QImage(physicalSize, QImage::Format_RGB32);
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image.setDevicePixelRatio(ratio);
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paintToImage(image);
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_memory += image.sizeInBytes();
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}
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p.drawImage(0, 0, image);
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}
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void invalidate(uint64 rowId);
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void clear();
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private:
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static constexpr auto kLimit = 256;
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static constexpr auto kMemoryLimit = 32 * 1024 * 1024;
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base::flat_map<uint64, QImage> _images;
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base::Timer _stopTimer;
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int64 _memory = 0;
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bool _scrolling = false;
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};
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} // namespace Ui
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